( x + 1 )( 2x - 3 )=0
    x＾2+2x-2=0
    c(100,10)
    x+5/7x=24
    1799-【【1799-（1799-y）×0.15】】-(1799-y)=1299
    1799-【【1799-（1799-y）*0.15】】-(1799-y)=1299
    9*x^2-2x-39=0
    5X-90=4X
    9*x^2-2x-39=0
    (x+2)/(x²-1)=2/(x+1)-2/(x-1)
    20 x+100=32 x-20
    20X+100=32X-20
    20X+100=32X-20
    20X+10=32X-10
    (x+2)/(x²-1)=2/(x+1)-3/(x-1)
    2.15x2+5x+180=0
    2.25x2+5x+180=0
    0.75a+0.5a²+5÷a-6 = -3.5
    0.75a+0.5a²+5÷a-6 = -3.5
    0.75a+0.5a²+5÷a-6=-3.5

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